Piston construction



March 5,1946; v J, J, Mls I -2',396,018

PISTON CONSTRUCTION Filed May 20, 1944 BY a , mthvenamreisteitttm rsasedtimaiace I I T E TES P E OFFICE panama-mm;- I

cdastructi n, such as employed in internal combustion engines 'orthe like,and'itconsistsin theconstructions,

arrangements and combinations herein described and claimed.

It is the particular object or the invention to' provide a piston construction in which means are providedfor uniformly lubricating the cylinder walls and piston under of the piston. 1

More particularly it is an reciprocating movements object of the inventiontoprovideapistoninwhichanangeonthe' interior of the piston enables the catching of oil for distribution to the cylinder walls through suitably shaped ports formed in the skirt of the piston.

It is also an object of the "invention to provide Y a novel lubricating means for the so-called "oil ring" of the piston. 7

Additional objects, advantagesand features of invention will be apparent from the following de- Figure 1 is a longitudinal section partly in elevation illustrating a piston constructed in accordance with myinvention.

Figure 2 is abottom plan'view thereof.

smiluzamesahmo. twist ura ium-c) V li'arepositionedinstaggered relation,- asmay beseenin1'iguresl,3and4,'sothatportswill open a ternately lmn the faces I! and II,"

Preierablythe ports II are of conical shape, the apex-of which is directed toward the faces l1 and A recess 2|. is formed in theoil groove l2 extending circumferentially and connecting ducts I I.

In operation, when the piston moves oil .will be caught upon the face I! for discharge through the ports I! which will deposit oil between the piston and cylinder with. On the down stroke of the piston'the face ll functions in a like manner,it being understood that there is usually a dense oil vapor within the piston.

The ducts l4 function for removal of excessive the piston is traveling toward thecrank shaft.

Figure 315 a section on the'line 3-3 ofFigure 1. FigureiisasectiononthelineHofl 'lgure 1.

Figure 5 is a fragmentary section of the piston on menus 5-! of Figure 2. .i 'igure 8 is a fragmentary top plan view of thepi onmartiyinsection.

.There is illustrated a piston ll of conventional form including a skirt portion l I and ring grooves i2 and ll'and the usual bosses It for mounting of a wrist pin, as well understood.

- The skirt ll, however, is of substantial thickness and at suitably spaced points circumferenscription and accompanying drawing, wherein j the oil ring located in the groove l2 collects oil a acceleration in the first quarter of a cycle and in the second quarter of the cycle loses acceleration,

the column of air and oil in ducts ll will lubricate the cylinder and piston.

When the pistontravels away from the crank shaft, the action in ducts I4 is stopped, since the .oil ring bears upon the upper ends of the ducts ll, it being understood that the ports i5 functioning as air inlets, enabling the ducts M to operate in construction as fairly fall within the scope or the appended claims.

tially thereof a pmrality of longitudinally extending ducts it are formed; opening upon the bottom of the skirt as well as upon the oilring groove II.

A plurality of ports ii. are formed in the piston body adapted to register with the Oil ring l2.

At a point below the bosses ll a flange II is formed as an integral part of the skirt of the piston. The flange projects from the wall of the pis-' ton a suitable distance, and is provided with upper and lower converging faces II and it respectively. The faces I1 and 18 function to direct oil toward the wall of the piston and in order that oil accumulated may be supplied to the cylinder wall of an engine, ports I! are formed spaced circumierentially around the skirt of the piston,

I claim: 4

1. A piston for internal bustion engines and the like comprising a body having a skirt portion and an oil ring groove, ducts formed circumferentially on the skirt and opening upon the groove,

a plurality 01 air vent ports between the oil rin groove and the interior of the body, said. skirt having ports adjacent the lower end thereof and means on the interior of the skirtfor feeding oil tosaid ports.

2. A piston for internal combustion engines and v the like comprising a body having a skirt portion and an oil ring groove, longitudinal ducts between the lower end of the skirt and in comwith the interior or the body. said skirt havin: a, plurality of ports adjacent the lower end thereof, said parts being cireumierentially spaced, and means on the interior 0! the skirt fox-catching oil for discharge into said lest named ports upzm re- 7 ,ciprocation or the piston. 3. The structure 0! elatim 2 in which the means "forcetchlngtheoileoneistsotnflange hnvin:

inwardly conversing feces and said ports are Dositioned so as to open on said faces in .alternate fashion. 4. The structure of claim 2 in which the D011! I o! the skirt are of conical form, the-npex being direetedtoward the interior of the skirt.

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